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Superconducting and magnetic properties of melt-quenched Bi-2223 superconductors doped with Pb and Te

โœ Scribed by E.S. Vlakhov; K.A. Nenkov; M. Ciszek; A. Zaleski; Y.B. Dimitriev

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
655 KB
Volume
225
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

Samples of the Bi-Te-Pb-Sr-Ca-Cu-O system with various nominal compositions were prepared by a free melt-quenching and subsequent annealing procedure. Phase formation, To, Jc, Be2 (0), and irreversibility line were investigated employing direct measurements as well as estimations by AC losses and AC magnetic susceptibility measurements techniques. The intrinsic and coupling critical temperatures systematically increase with prolonged annealing time for samples with nominal composition Bil.6Pbo.aTeo.lSr2CaaCu4Oy. At the low magnetic field region up to 100 Oe the linear relation ( 1 -Tp/Tยข) vs. H 1/3 is fulfilled. Increased upper critical field values up to Be:(0) =201.4 T were obtained. An optimal annealing time (about 72 h, 835ยฐC, air, sample $4.2) exists at which minimal normal state resistivity as well as enhanced flux pinning (maximal B~2(0) values) were reached.

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